0. This is nothing new, airbnb always had a free "guarantee" they just rebranded it basically from what I see to a trademarkable name.
1. Umbrella policy is better than airbnb. Umbrella policy will go after all parties including airbnb on your behalf.
2. Airbnb has a history of ignoring or mitigating damages unless you get famous on social media - this includes sexual assault/rape and murder of animals.
https://community.withairbnb.com/t5/Help/Guest-caused-the-de...
https://www.theguardian.com/technology/2021/jun/16/airbnb-ne...
While these are just two incidents, there are countless more that can be searched, or you can probably filter through other incidents, and yes, while airbnb did "compensate" they did so only after intense media pressure.
3. If you are a tourist in most countries and "fly" back home, you are judgement proof. There only liability is the guests airbnb account, which, is worthless. You can create new accounts, and in most places you can use alternative government identification to bypass previous bans.
You can read the link I posted earlier about the death of a dog, the PII that airbnb released was not enough to start a civil court case. And even if you have a name, you have no guarantee that the nae of the airbnb account is the ACTUAL guest that stayed.